Braidwood police arrested four people as part of a six-month investigation into drug trafficking in the city, police said.

Braidwood Police Chief Nick Ficarello said in a news release that intelligence acquired by the police identified Dominic Megrant, 27, of the 700 block of Lilly Lane in Romeoville, as a possible drug dealer in the city.

Police found Megrant on Monday in Braidwood and arrested him. Megrant had a warrant for his arrest for failing to appear in court in a possession of a controlled substance case.

At the time of his arrest, he was holding heroin, police said, and he was charged with possession of a controlled substance.

On Wednesday, Braidwood police received assistance from the Joliet police, the Drug Enforcement Administration and Romeoville police to arrest three more people on charges of unlawful delivery of cocaine.

Over the years, the Braidwood police have been cracking down on heroin and prescription opioid abuse.

In August, a 12-officer team of Braidwood and Drug Enforcement Administration officials arrested four suspects on charges of delivery of controlled substances. The drugs involved in that case included Ecstasy, prescription pills, meth, fentanyl, powder cocaine, crack, opioids and benzodiazepines, police said.

“We’re working off an old theory,” Ficarello said.

“If you decrease the amount of narcotic trafficking and ultimately decrease the amount of addiction, your crime rate will lower,” Ficarello said.

Ficarello said heroin and prescription opioids, cocaine and crystal meth are among the area’s biggest problems.

In April, Braidwood police raided a residence and arrested several people on drug charges.